James herzog



No. 6l9,304. Patented Feb. I4, I899. J HERZOG JACK SCREW.

(Application filed June 8, 1898.)

(N0 Model.)

UNi ED STATES PATENT OFFICE JAMES HERZOG, OF DUBUQUE, IOWA, ASSIGNOR OF ONE-HALF TO M. SOHEIDEOKER, OF SAME PLACE.

JACK-SCREW.

SPECIFICATION forming part of Letters Patent No. 619,304, dated February 14, 1899; Application filed Tune 8, 1898. Serial No. 682,898. (No model.)

To all whom it may concern:

Be it known that 1, JAMES HERZOG, a citizen of the United States, residing at Dubuque, in the county of Dubuque and State of Iowa, have invented a new and useful J ack-Sorew, of which the following is a specification.

The invention relates to improvements in lifting-jacks.

The object of the present invention is to improve the construction of lifting-jacks and to provide a simple and comparatively inexpensive one which will possess great strength and durability and which will enable a heavy load to be readily raised.

The invention consists in the construction and novel combination and arrangement of parts, as hereinafter fully described, illustrated in the accompanying drawings, and

pointed out in the claims hereto appended.

In the drawings, Figure 1 is a perspective view of a lifting-jack constructed in accordance with this invention. Fig. 2 is a longitudinal sectional view of the same. Fig. 3 is a transverse sectional view. Fig. 4 is a detail perspective view of the bed or frame.

Like numerals of reference designate corresponding parts in all the figures of the drawlugs.

1 designates a bed or frame constructed of suitable metal and provided with a longitudinal recess forming sides 2for guidinga longitudinally-movahle wedge 3, which is adapted to engage at ransverse supporting-plate 4. The recess extends through the bottom of the frame or bed at one end, and it varies indepth at the other end to form a solid inclined portion 5, up which the wedge is caused to travel by means of a screw The screw 6 passes through a threaded opening 7 of the end 8 of the frame or bed, and it engages the butt-end of the wedge, as clearly shown in Fig. 2 of the accompanying drawings. The open portion of the bed or frame adjacent to the larger portion of the wedge is substantially U-shaped and is arranged at a slightangle to the other portion of the frame or bed, as shown.

The upper face of the wedge is horizontal, and the supporting-plate 4, which is rectangular, fits between the sides of the frame or bed when it is in its lowermost position, and it is provided at opposite sides with depending L- shaped arms 9, arranged in grooves 10 of the sides of the frame or bed. The grooves 10, which extend vertically across the outer faces of the sides, have horizontal branches or portions 11, which are formed in the upper faces of the sides.

As the Wedge is forced forward longitudinally of the frame or bed by rotating the screw 6 it is interposed between the inclined portion 5 between the sides 2 and the supporting-plate, which is lifted by such movement of the wedge, it being guided in its vertical movement by the arms 9, which prevent the supporting-plate from slipping longitudinally of the wedge or frame.

The invention has the following advantages: The liftingjack possesses great strength and durability and is simple and comparatively inexpensive in construction, and as it combines a screw and a wedge it is capable of exerting great force and of readily lifting a heavy load. The supporting-plate, which directly engages the load to be raised, is held against longitudinal movement by the arms, which are guided in the grooves or ways of the frame or bed.

Changes in the form, proportion, and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of this invention.

What I claim is- 1. Alifting-jack comprising a frame having a longitudinal recess forming a solid inclined portion at one end and an open substantially U -shaped portion at the other end of the frame, a longitudinally-movable wedge ar ranged within the frame on the solid inclined portion and extending into the open U -shaped portion, a supporting-plate arranged to be engaged by the wedge and located over the solid portion of the frame, and a screw mounted in the U -shaped portion of the frame and engaging the wedge, substantially as described.

2. A lifting-jack comprising a frame or bed provided with an inclined portion and having vertical grooves, a wedge arranged on the inclined portion of the bed or frame, and a supporting-plate located above the wedge and provided with depending L-shaped arms guided said grooves, and a screw mounted on the frame or bed and engaging the Wedge, substantially as described.

In testimony that I claim the foregoing as 15 my own I have hereto affixed my signature in the presence of two witnesses.

JAMES HERZOG.

Witnesses:

J. A. MCKINLAY, HENRY B. GRIFFKE. 

